by connection of stud-and-socket type, e.g. spring-loaded

Full Title

Arrangement of road signs or traffic signals; Arrangements for enforcing caution (for obstructing or restricting traffic E01F13/00) > Upright bodies, e.g. marker posts or bollards; Supports for road signs > characterised by form or by structural features, e.g. for enabling displacement or deflection > specially adapted for breaking, disengaging, collapsing or permanently deforming when deflected or displaced, e.g. by vehicle impact > by connection of stud-and-socket type, e.g. spring-loaded